Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina

Autores
Poma, Stella Maris; Ramos, Adriana Maria; Litvak, Vanesa Dafne; Quenardelle, Sonia Monica; Maisonnave, Emma Beatriz; Díaz, Iris
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A Miocene to Pliocene (13 to 4.6 Ma) mostly pyroclastic sequence is exposed along the Iglesia Valley, to the east of the former main volcanic arc. This area is a transitional region between Cordillera Frontal and Precordillera, over the flat slab segment of the Southern Central Andes, at 29°30' S to 30°00' S. New radiometric ages, geochemical data, petrography and field relationships are evaluated to establish differences and similarities between Miocene arc-related sequences across the main arc and its expansion towards a back arc position, in western Precordillera. Analyzed rocks have a magmatic arc signature partially like the former main volcanic arc to the west. The Iglesia Valley rocks are LREE-enriched (La/Sm: 3.7-6.5) with respect to HREE (Sm/Yb: 2.2-6.0) and define patterns with a pronounced slope. Sm/Yb ratios generally increase with time, as pressures increase, with retention of HREE in residual mineralogy, particularly garnet at Sm/Yb>4. Volcanic activity in Cordillera Frontal and the volcanic-volcaniclastic expression in Precordillera show a continuous increase in the La/Yb ratio with decreasing age. Variations in the residual mineral phase equilibrating with magmas would be related to the progressive increase in crustal thickness due to the tectonic compressive regime resulting from shallow subduction since Middle Miocene. The data presented suggest that the arc magmatic activity during the Miocene was expanded notably to the East in relation to the location of the main arc at Valle del Cura, in Cordillera Frontal. The extensive amplitude of the volcanic arc activity is indicative of the slab gradual flattening. Particularly, the mantle-derived magmas from Lomas del Campanario Formation (Western Precordillera) are enriched by subduction related fluids but also by crustal components. It is interpreted that the cause of the geochemical differences between the back arc position rocks and the main arc lay in the heterogeneous composition of the underlying continental crust involved in both locations. Presence of volcanic rocks with adakitic geochemical affinity probably reflect astenospheric-derived melts that interacted through a heterogeneous and thickened crust toward the surface.
Fil: Poma, Stella Maris. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Ramos, Adriana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Litvak, Vanesa Dafne. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Quenardelle, Sonia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Maisonnave, Emma Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Díaz, Iris. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
Materia
ARC EXPANSION
GEOCHEMISTRY
MIOCENE MAGMATISM
RADIOMETRIC AGE
SHALLOW SUBDUCTION
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/66404
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/66404
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western ArgentinaMagmatismo neógeno en la sección sur de los Andes centrales sobre la zona de subducción horizontal pampeana: Implicancias respecto de las contribuciones de los fundidos corticales y de la placa subductada en la generación de magmas en precordillera, ArgentinaPoma, Stella MarisRamos, Adriana MariaLitvak, Vanesa DafneQuenardelle, Sonia MonicaMaisonnave, Emma BeatrizDíaz, IrisARC EXPANSIONGEOCHEMISTRYMIOCENE MAGMATISMRADIOMETRIC AGESHALLOW SUBDUCTIONhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1A Miocene to Pliocene (13 to 4.6 Ma) mostly pyroclastic sequence is exposed along the Iglesia Valley, to the east of the former main volcanic arc. This area is a transitional region between Cordillera Frontal and Precordillera, over the flat slab segment of the Southern Central Andes, at 29°30' S to 30°00' S. New radiometric ages, geochemical data, petrography and field relationships are evaluated to establish differences and similarities between Miocene arc-related sequences across the main arc and its expansion towards a back arc position, in western Precordillera. Analyzed rocks have a magmatic arc signature partially like the former main volcanic arc to the west. The Iglesia Valley rocks are LREE-enriched (La/Sm: 3.7-6.5) with respect to HREE (Sm/Yb: 2.2-6.0) and define patterns with a pronounced slope. Sm/Yb ratios generally increase with time, as pressures increase, with retention of HREE in residual mineralogy, particularly garnet at Sm/Yb>4. Volcanic activity in Cordillera Frontal and the volcanic-volcaniclastic expression in Precordillera show a continuous increase in the La/Yb ratio with decreasing age. Variations in the residual mineral phase equilibrating with magmas would be related to the progressive increase in crustal thickness due to the tectonic compressive regime resulting from shallow subduction since Middle Miocene. The data presented suggest that the arc magmatic activity during the Miocene was expanded notably to the East in relation to the location of the main arc at Valle del Cura, in Cordillera Frontal. The extensive amplitude of the volcanic arc activity is indicative of the slab gradual flattening. Particularly, the mantle-derived magmas from Lomas del Campanario Formation (Western Precordillera) are enriched by subduction related fluids but also by crustal components. It is interpreted that the cause of the geochemical differences between the back arc position rocks and the main arc lay in the heterogeneous composition of the underlying continental crust involved in both locations. Presence of volcanic rocks with adakitic geochemical affinity probably reflect astenospheric-derived melts that interacted through a heterogeneous and thickened crust toward the surface.Fil: Poma, Stella Maris. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Ramos, Adriana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Litvak, Vanesa Dafne. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Quenardelle, Sonia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Maisonnave, Emma Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Díaz, Iris. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; ArgentinaServicio Nacional de Geología y Minería2017-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/66404Poma, Stella Maris; Ramos, Adriana Maria; Litvak, Vanesa Dafne; Quenardelle, Sonia Monica; Maisonnave, Emma Beatriz; et al.; Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina; Servicio Nacional de Geología y Minería; Andean Geology; 44; 3; 9-2017; 249-2740718-70920718-7106CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.5027/andgeoV44n3-a02info:eu-repo/semantics/altIdentifier/url/http://www.andeangeology.cl/index.php/revista1/article/view/V44n3-a02info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:21:32Zoai:ri.conicet.gov.ar:11336/66404instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:21:33.213CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina
Magmatismo neógeno en la sección sur de los Andes centrales sobre la zona de subducción horizontal pampeana: Implicancias respecto de las contribuciones de los fundidos corticales y de la placa subductada en la generación de magmas en precordillera, Argentina
title Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina
spellingShingle Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina
Poma, Stella Maris
ARC EXPANSION
GEOCHEMISTRY
MIOCENE MAGMATISM
RADIOMETRIC AGE
SHALLOW SUBDUCTION
title_short Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina
title_full Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina
title_fullStr Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina
title_full_unstemmed Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina
title_sort Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina
dc.creator.none.fl_str_mv Poma, Stella Maris
Ramos, Adriana Maria
Litvak, Vanesa Dafne
Quenardelle, Sonia Monica
Maisonnave, Emma Beatriz
Díaz, Iris
author Poma, Stella Maris
author_facet Poma, Stella Maris
Ramos, Adriana Maria
Litvak, Vanesa Dafne
Quenardelle, Sonia Monica
Maisonnave, Emma Beatriz
Díaz, Iris
author_role author
author2 Ramos, Adriana Maria
Litvak, Vanesa Dafne
Quenardelle, Sonia Monica
Maisonnave, Emma Beatriz
Díaz, Iris
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv ARC EXPANSION
GEOCHEMISTRY
MIOCENE MAGMATISM
RADIOMETRIC AGE
SHALLOW SUBDUCTION
topic ARC EXPANSION
GEOCHEMISTRY
MIOCENE MAGMATISM
RADIOMETRIC AGE
SHALLOW SUBDUCTION
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv A Miocene to Pliocene (13 to 4.6 Ma) mostly pyroclastic sequence is exposed along the Iglesia Valley, to the east of the former main volcanic arc. This area is a transitional region between Cordillera Frontal and Precordillera, over the flat slab segment of the Southern Central Andes, at 29°30' S to 30°00' S. New radiometric ages, geochemical data, petrography and field relationships are evaluated to establish differences and similarities between Miocene arc-related sequences across the main arc and its expansion towards a back arc position, in western Precordillera. Analyzed rocks have a magmatic arc signature partially like the former main volcanic arc to the west. The Iglesia Valley rocks are LREE-enriched (La/Sm: 3.7-6.5) with respect to HREE (Sm/Yb: 2.2-6.0) and define patterns with a pronounced slope. Sm/Yb ratios generally increase with time, as pressures increase, with retention of HREE in residual mineralogy, particularly garnet at Sm/Yb>4. Volcanic activity in Cordillera Frontal and the volcanic-volcaniclastic expression in Precordillera show a continuous increase in the La/Yb ratio with decreasing age. Variations in the residual mineral phase equilibrating with magmas would be related to the progressive increase in crustal thickness due to the tectonic compressive regime resulting from shallow subduction since Middle Miocene. The data presented suggest that the arc magmatic activity during the Miocene was expanded notably to the East in relation to the location of the main arc at Valle del Cura, in Cordillera Frontal. The extensive amplitude of the volcanic arc activity is indicative of the slab gradual flattening. Particularly, the mantle-derived magmas from Lomas del Campanario Formation (Western Precordillera) are enriched by subduction related fluids but also by crustal components. It is interpreted that the cause of the geochemical differences between the back arc position rocks and the main arc lay in the heterogeneous composition of the underlying continental crust involved in both locations. Presence of volcanic rocks with adakitic geochemical affinity probably reflect astenospheric-derived melts that interacted through a heterogeneous and thickened crust toward the surface.
Fil: Poma, Stella Maris. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Ramos, Adriana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Litvak, Vanesa Dafne. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Quenardelle, Sonia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Maisonnave, Emma Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Díaz, Iris. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina
description A Miocene to Pliocene (13 to 4.6 Ma) mostly pyroclastic sequence is exposed along the Iglesia Valley, to the east of the former main volcanic arc. This area is a transitional region between Cordillera Frontal and Precordillera, over the flat slab segment of the Southern Central Andes, at 29°30' S to 30°00' S. New radiometric ages, geochemical data, petrography and field relationships are evaluated to establish differences and similarities between Miocene arc-related sequences across the main arc and its expansion towards a back arc position, in western Precordillera. Analyzed rocks have a magmatic arc signature partially like the former main volcanic arc to the west. The Iglesia Valley rocks are LREE-enriched (La/Sm: 3.7-6.5) with respect to HREE (Sm/Yb: 2.2-6.0) and define patterns with a pronounced slope. Sm/Yb ratios generally increase with time, as pressures increase, with retention of HREE in residual mineralogy, particularly garnet at Sm/Yb>4. Volcanic activity in Cordillera Frontal and the volcanic-volcaniclastic expression in Precordillera show a continuous increase in the La/Yb ratio with decreasing age. Variations in the residual mineral phase equilibrating with magmas would be related to the progressive increase in crustal thickness due to the tectonic compressive regime resulting from shallow subduction since Middle Miocene. The data presented suggest that the arc magmatic activity during the Miocene was expanded notably to the East in relation to the location of the main arc at Valle del Cura, in Cordillera Frontal. The extensive amplitude of the volcanic arc activity is indicative of the slab gradual flattening. Particularly, the mantle-derived magmas from Lomas del Campanario Formation (Western Precordillera) are enriched by subduction related fluids but also by crustal components. It is interpreted that the cause of the geochemical differences between the back arc position rocks and the main arc lay in the heterogeneous composition of the underlying continental crust involved in both locations. Presence of volcanic rocks with adakitic geochemical affinity probably reflect astenospheric-derived melts that interacted through a heterogeneous and thickened crust toward the surface.
publishDate 2017
dc.date.none.fl_str_mv 2017-09
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/66404
Poma, Stella Maris; Ramos, Adriana Maria; Litvak, Vanesa Dafne; Quenardelle, Sonia Monica; Maisonnave, Emma Beatriz; et al.; Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina; Servicio Nacional de Geología y Minería; Andean Geology; 44; 3; 9-2017; 249-274
0718-7092
0718-7106
CONICET Digital
CONICET
url http://hdl.handle.net/11336/66404
identifier_str_mv Poma, Stella Maris; Ramos, Adriana Maria; Litvak, Vanesa Dafne; Quenardelle, Sonia Monica; Maisonnave, Emma Beatriz; et al.; Southern central andes neogene magmatism over the pampean flat slab: Implications on crustal and slab melts contribution to magma generation in Precordillera, Western Argentina; Servicio Nacional de Geología y Minería; Andean Geology; 44; 3; 9-2017; 249-274
0718-7092
0718-7106
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.5027/andgeoV44n3-a02
info:eu-repo/semantics/altIdentifier/url/http://www.andeangeology.cl/index.php/revista1/article/view/V44n3-a02
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Servicio Nacional de Geología y Minería
publisher.none.fl_str_mv Servicio Nacional de Geología y Minería
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.48226

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